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Ultrafine-grained pure Al and Al-based composites with 10 and 20vol% of Al 2 O 3 were produced by cold consolidation of powders using high-pressure torsion (HPT). Ball-on-disc wear resistance of Al was improved by HPT when compared to its coarse-grained counterpart processed with H24 treatment (cold rolling followed by low-temperature annealing). Wear width decreased but wear depth...
Railway vehicles require a certain level of wheel–rail adhesion for efficient, reliable, and economical operation. A comprehensive wheel–rail contact model is useful for optimizing the adhesion, to simulate vehicle running conditions and to predict wear and rolling contact fatigue. A new contact model using measured 3D surfaces has been developed, comprising normal contact, rolling–sliding contact,...
A preliminary two dimensional numerical model of wheel/rail in rolling contact is established to study the adhesion characteristics of wheel/rail with considering surface roughness under oil and water mixed contamination. A partial elastohydrodynamic lubrication (EHL) theory in line contact is applied in the model. The present numerical model is used to investigate the effects of contact pressures...
During the forming of aluminium alloys there are several difficulties associated with controlling the process parameters and the product quality due to the severity of the contact. Adhesion and, in particular, the formation of transfer films of aluminium alloys on the surfaces of hot-work tool steels are very negative phenomena in this process and require a better understanding. The present work is...
The material used to produce one baht coin in the Royal Thai Mint has been changed from cupronickel (75% Cu and 25% Ni) to nickel-electroplated steel, not only for economic reasons but also for the durable properties of the latter. As a result, the higher hardness value of the new material (110 HV30 versus 80 HV10) combined with the high accuracy requirements of the coin detail have reduced the durability...
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